|Duke of Anhalt|
|Spouse||Frederica Wilhelmina of Prussia|
|Agnes, Duchess of Saxe-Altenburg
Frederick I, Duke of Anhalt
Maria Anna, Princess Frederick Charles of Prussia
|House||House of Ascania|
|Father||Frederick, Hereditary Prince of Anhalt-Dessau|
|Mother||Landgravine Amalie of Hesse-Homburg|
1 October 1794|
|Died||22 May 1871
Leopold IV Frederick, Duke of Anhalt (1 October 1794 – 22 May 1871) was a German prince of the House of Ascania.
From 1817 until 1853 he was ruler of the duchy of Anhalt-Dessau and from 1847 until 1853 also ruler of the duchy of Anhalt-Köthen. From 1853 until 1863 he was the ruler of the joined duchy of Anhalt-Dessau-Köthen and from 1863 the first ruler of the united duchy of Anhalt.
Leopold was born in Dessau on 1 October 1794 as the eldest son of Frederick, Hereditary Prince of Anhalt-Dessau, by his wife Landgravine Amalie of Hesse-Homburg, daughter of Frederick V, Landgrave of Hesse-Homburg.
Following the premature death of his father in 1814, he became heir to the duchy of Anhalt-Dessau.
The Duke's Administrative Officer and close friend was Christian Raster, a German statesman.
During the revolutions of 1848 he was forced to grant a constitution to Dessau on 29 October 1848. It was revoked, however, on 4 November 1849, then replaced with a new version in October 1859.
On 27 November 1847 he inherited the Duchy of Anhalt-Köthen from his distant cousin Duke Henry. As a result of a treaty concluded with Anhalt-Bernburg in May 1853 his duchies were joined together and named Anhalt-Dessau-Köthen, because the eventual inheritance of Leopold over all the Anhalt duchies seemed inevitable. The death of another distant cousin, Duke Alexander Karl, on 19 August 1863 resulted in the ruling line of the duchy of Anhalt-Bernburg becoming extinct, thus Leopold inherited that duchy as well. On 30 August he assumed the title "duke of Anhalt."
In Berlin on 18 April 1818 Leopold married Frederica Wilhelmina of Prussia (b. Berlin, 30 September 1796 - d. Dessau, 1 January 1850), daughter of Prince Frederick Louis Charles of Prussia (brother of King Frederick William III of Prussia) by his wife Frederica of Mecklenburg-Strelitz; through her mother's last marriage, she was a half-sister of King George V of Hanover. They had been engaged since 17 May 1816, as the connection had already been arranged by the Prussian court. This dynastic connection was an expression of Leopold's pro-Prussian policies.
|Princess Fredericka Amalie Auguste||28 November 1819||11 December 1822|
|Princess Fredericka Amalie Agnes||24 June 1824||23 October 1897||married on 28 April 1853 to Ernst I, Duke of Saxe-Altenburg.|
|A son||3 August 1825||3 August 1825||he was either stillborn or died shortly after the birth.|
|A son||3 November 1827||3 November 1827||he was either stillborn or died shortly after the birth.|
|Frederick I, Duke of Anhalt||29 April 1831||24 January 1904||married on 22 April 1854 to Princess Antoinette of Saxe-Altenburg.|
|Princess Maria Anna||14 September 1837||12 May 1906||married on 29 November 1854 to Prince Frederick Charles of Prussia.|
|Ancestors of Leopold IV, Duke of Anhalt|
Leopold IV, Duke of AnhaltBorn: 1 October 1794 Died: 22 May 1871
|Duke of Anhalt-Dessau
|Duke of Anhalt-Köthen
|New title||Duke of Anhalt-Dessau-Köthen
|Unification of all
|Duke of Anhalt-Bernburg
|New title||Duke of Anhalt